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EP45-UD3R won't run 2 sticks of ram

OK so I purchased this board about 2 months ago. One day it would not boot and it would only run with 1 stick of ram after cleaning CMOS etc. well, i got sick of it and bought a new one. I installed the new one today, and guess what, it won't run 2 sticks of ram either.
I put in one stick it runs fine. I put in two sticks, it won't even get to bios. I have 5 different sets of ram I have tried all with the same issue, so my ram is not bad.

Any ideas what is going on? Right now the set-up is at stock speeds. All hardware is in sig. Only possible thing i can think of is my PSU is going bad...it is over 2 yrs old. Weird thing is, I can OC my system to 471x8.5 with no issues.

Re: EP45-UD3R won't run 2 sticks of ram

i am saying the previous board...rev 1.0 was doing this, so I bought a new one rev 1.1 hoping it would be fixed. With the new board, it does the exact same thing.

1 stick=work fine
2 stick= power cycle) it does not even get to bios--it powers on, stops, powers on, stops, power on...)

I have done the CMOS reset numerous times. At this point, I am going to buy a new PSU. It is the only thing I can think that would do this, since it is 2 yrs old, maybe it is failing. Funny thing is, I can OC my proc to 4ghz and OC my gfx card with no issues.

Re: EP45-UD3R won't run 2 sticks of ram

Had the same issue when going from Standard Crucial 2x2gb PC6400 to Crucial 2x2gb Ballistix PC6400. This is what I did. Put in what ever memory configuration will boot. Went into bios and loaded optimized defaults, and changed the FSB to 266, save and rebooted. Shut down the machine and popped in the new RAM. Then after it booted I proceeded to tweak the settings, had no problems from there. You could try loading the fail safe defaults and that would allow you to boot with both sticks without messing with the FSB.